By Unity Blott For Mailonline. The 'nature buff', from Portland, Oregon, sets pulses racing with sizzling snaps of her hikes around the US, where she is either completely in the nude or partially dressed. Sara Jean, 32, who also works as a model and has dated Ryan Seacrest, has managed to build a huge social media following thanks to her scantily-clad selfies taken atop canyons and stunning mountain ranges. A former Playboy cover girl, she has spent the past year 'hiking in the great outdoors and taking some amazing pictures along the way' - and says there's even more to come in Former Playmate Sara Jean Underwood sets pulses racing with a saucy Instagram snap wearing nothing but denim hot pants and braces during a recent hiking adventure. On top of the world!